{
 "cells": [
  {
   "cell_type": "code",
   "id": "initial_id",
   "metadata": {
    "collapsed": true,
    "ExecuteTime": {
     "end_time": "2025-09-26T03:56:42.173393Z",
     "start_time": "2025-09-26T03:56:39.130908Z"
    }
   },
   "source": [
    "import torch\n",
    "\n",
    "from d2l_learn.utils import *\n",
    "batch_size, num_steps = 32, 35\n",
    "train_iter, vocab = load_data_time_machine(batch_size, num_steps)"
   ],
   "outputs": [],
   "execution_count": 1
  },
  {
   "metadata": {
    "ExecuteTime": {
     "end_time": "2025-09-26T03:56:42.181197Z",
     "start_time": "2025-09-26T03:56:42.177617Z"
    }
   },
   "cell_type": "code",
   "source": [
    "def get_params(vocab_size, num_hiddens, device):\n",
    "    num_inputs = num_outputs = vocab_size\n",
    "    def normal(shape):\n",
    "        return torch.randn(shape).to(device)*0.01\n",
    "    def three():\n",
    "        return (\n",
    "            normal((num_inputs, num_hiddens)),\n",
    "            normal((num_hiddens, num_hiddens)),\n",
    "            torch.zeros(num_hiddens).to(device),\n",
    "        )\n",
    "    # 输入门参数\n",
    "    W_xi, W_hi, b_i = three()\n",
    "    # 遗忘门参数\n",
    "    W_xf, W_hf, b_f = three()\n",
    "    # 输出门参数\n",
    "    W_xo, W_ho, b_o = three()\n",
    "    # 候选记忆元参数\n",
    "    W_xc, W_hc, b_c = three()\n",
    "    # 输出层参数\n",
    "    W_hq, b_q = normal((num_hiddens, num_outputs)), torch.zeros(num_outputs).to(device)\n",
    "    params = [W_xi, W_hi, b_i, W_xf, W_hf, b_f, W_xo, W_ho, b_o, W_xc, W_hc, b_c, W_hq, b_q]\n",
    "    for param in params:\n",
    "        param.requires_grad_(True)\n",
    "    return params\n",
    "def init_lstm_state(batch_size, num_hiddens, device):\n",
    "    return torch.zeros(batch_size, num_hiddens).to(device), torch.zeros(batch_size, num_hiddens).to(device)"
   ],
   "id": "256daef0b7d98aee",
   "outputs": [],
   "execution_count": 2
  },
  {
   "metadata": {
    "ExecuteTime": {
     "end_time": "2025-09-26T03:56:42.188835Z",
     "start_time": "2025-09-26T03:56:42.185729Z"
    }
   },
   "cell_type": "code",
   "source": [
    "def lstm(inputs, params, state):\n",
    "    W_xi, W_hi, b_i, W_xf, W_hf, b_f, W_xo, W_ho, b_o, W_xc, W_hc, b_c, W_hq, b_q = params\n",
    "    H,C = state\n",
    "    outputs = []\n",
    "    for X in inputs:\n",
    "        I = torch.sigmoid((X @ W_xi + H @ W_hi + b_i))\n",
    "        F = torch.sigmoid((X @ W_xf + H @ W_hf + b_f))\n",
    "        O = torch.sigmoid((X @ W_xo + H @ W_ho + b_o))\n",
    "        C_tilda = torch.tanh((X @ W_xc + H @ W_hc + b_c))\n",
    "        C = F * C + I * C_tilda\n",
    "        H = O * torch.tanh(C)\n",
    "        Y = H @ W_hq + b_q\n",
    "        outputs.append(Y)\n",
    "    return torch.cat(outputs, dim=0), (H, C)"
   ],
   "id": "ed92a2e217e7f955",
   "outputs": [],
   "execution_count": 3
  },
  {
   "metadata": {},
   "cell_type": "code",
   "source": [
    "vocab_size, num_hiddens = len(vocab), 256\n",
    "device = torch.device(\"mps\" if torch.backends.mps.is_available() else \"cpu\")\n",
    "lr, num_epochs = 1, 500\n",
    "model = RNNModelScratch(get_params, vocab_size, num_hiddens, device, init_lstm_state, lstm)\n",
    "train_ch8(model, train_iter, vocab, lr, num_epochs, device)"
   ],
   "id": "534160404401b4ab",
   "execution_count": 4,
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "traveller amouby twas of hist lell there about in the other\n"
     ]
    },
    {
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  {
   "metadata": {},
   "cell_type": "code",
   "source": [
    "lstm_layer = nn.LSTM(vocab_size, num_hiddens)\n",
    "model = RNNModel(lstm_layer, vocab_size, num_hiddens)\n",
    "model.to(device)\n",
    "train_ch8(model, train_iter, vocab, lr, num_epochs, device)"
   ],
   "id": "1b0d27395401a612",
   "execution_count": 6,
   "outputs": [
    {
     "data": {
      "text/plain": [
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